Stereoscopic viewer



Aug.9,1949. 4EHA-VERS ETAL' 2,478,556

. STREOSCOBIC VIEWER Original Filed June 7, 1942 /A/vE/v TaRs.

v l l@y HTTORNEY.

Patented Aug. 9, 11,949

STEREOSC OBIC ,VIEWER VFranklin 1H.1`Ave-rs, Portage, and Edwardl). Krebs'p Evansvlle,-.Wis'., assignors -to Georger'. Krebsn trustee `Qrglnali,application. .June-D7, 1942,.. SeriaLNo.. 446,048, now'latent No. 2,385,183.,` dated "Sep-,fA

tomber '18,? 1945.

Divided and this' vapplication This .anplicationzis@divisioniof aces-pending application Serial: Nc..446.04.8,aiiled-June .7.19%2.; issued as U. S. Patent #2,385,183, Septemberxlv.Y 1945.5.. This .divisiohrrelates to a part of said copending.:.application.reterred to which is concerned with stereoscopic film photographs made according to theLmethods-andprinciples as disclosedinthatapplication...

The main object of the instantdivisional appli-:1 cation is to provide suitable and convenient means for viewing suchfor similarfpieturesafter mounting upon; a slide in a mannen-:and form .asuwill further appear. l Y s VIt is a further object toprovidefas `af-.seloarate unit, a-stereescope adapted rior.. viewing suchslides as illuminated transparencies...

Furthermore specic objectsfand meansvprovided for carrying out the objectives andpurposes of thelinvention WlLloebetter understood by referenceto the accompanyingdrawingswhich .constitute a. part of this.. specification.; They- 2 ,anima (o1. :ss-31) ing .the new V:formf of vstereoscopic.slide I ,i derived illustrate. one co-ordinated .preferred formnf Y mechanism and instrumentalities for utilizing and viewing stereoscopic pictures offthe kindfherein described` and disclosed. Similar-:refereneefnumerals indicate the same .partsgthroughnutthe several giues.

Figure 1 of the drawings herein depicts a mounted slide in which are mounted a multiplicity of stereoscopic pairs of transparencies derived from a twin lens camera constructed in accordance with the principles and teachings o the copending application.

Figures 2 and 3 present different aspects of a preferred form lof construction of the stereoscope adapted for stereoscopic viewing of such slides of the type as illustrated in Figure 1 and wherein the exposed and developed cinema films are translucent positive pictures which may be seen as positives by transmitted light.

The film strips are appropriately lmounted as shown for stereoscopic viewing in an oblong cardboard or metal slide or frame I into which a longitudinal window has been cut and into which the paired sections of the lm 2 may be set for viewing by transmitted light.

The window and the cut-out lm-strip may then be placed somewhat Voit center and nearer one end, thus leaving a wider margin at the other end as shown in Figure 1 for better manual control.

As will be seen from the strip of film as mounted in the slide, the picture of each frame has its altitude lying transversely of the linear course of the ribbon oi film (in the Seme manner as the from `the:stereoacamera,f heretoforefreferred to, there is a housing preferably comprising a'shal-i low oblong pan-shaped housing 8 andgafdetachable cover# yfor; closurefofnthe:housing, ci. the

viewer.. with .-a .sloping roei; 1*; .asr-shownsin.. the

top'plan; vewinrFie-,ure-f Th. ternak mecha-l nism and partsare @1111s. ateelfinisurefZ irrplari view of V"the, '.interiorga. removed.

The .mounted .Slidei .isinserted at tsrisht end.

(as shownr into. opening at: thesend-ofwthe housing .Brand-is uidedzandflinritedainits motion.y 4 A convenient and by a :te-lescopins-:member eiective method oivill. mlnatinsathe.'slidesfis shownfin: .Figure-.2.;:whe bysaflightfbulb I 5 :is set into its socket! 6. Nellie nneetedfwithfa .source of a electric power,^ suo. fafashvl-ieht battery placed fwthinpth .mollowrcylindrical; :handle I i (shown in. fracti l5., Hiny are y-prrwdedr withga; severablef. contact;

mechanism for. automatically makingiandibrealif ing the circuit at I4 and I4', the Contact ends of which latter are normally kept apart by the action of the pressure springs I3A and IBB, while the free end of I4 is being forced into the empty slide-track by the inward pressure of ISB. These respective parts are so disposed that the lightcircuit is closed when a picture-slide I has been advanced far enough into the slide-track to force the Vintruding disengaged end of I4 out of the slide-track and into contact engagement with the free end of I4, at the same time when the iirst pair of stereopictures 2 (say D and D) has come into alignment with the openings 3 and thus into the line of vision through the lenses.

Parts of the Wiring system may for convenience be mounted upon a block I2 composed of nonconductng material.

The twin viewing lenses and yeye pieces I0 are mounted on tubes (not separately shown) which are telescoped within the tube sleeves 9, the latter being longitudinally slotted for the protrusion 'of the pair of racks 5", integral with the slidable inner tubes, whereby the latter may be adjusted for focussing through the cooperative action of a pair of pinions and supporting rod 5 controlled by turning of the knob 5. For the further accommodation to the sight of different eye-spac- ...thez-.ceverefl has been ings, as may be desirable, a, slidable perforated disc (not shown in detail) may be placed behind either one of the twin eye-piece lenses and controlled in its inward and outward movement, as for instance by a bent arm 6 saddled over the shank of knurl-headecl thumb-nut E riding on a threaded stem 6".

In order to obtain a maximum of well-dispersed light from the illuminating bulb I5, and for nonglaring light-transmission through the translucent ilm pictures 2, it is desirable that the inner aspect of the cover 1 be provided with a pair of reflecting panels (not shown) placed at appropriate angles according to known principles for the desired light-dispersing eiect. The cover 1 is removably attached to the main body of the housing 8 as by insertion into a groove under a ledge I8 the other end being held in place by the pressure of a resilient member l1.

The stereoscope as actually illustrated in the drawings has been adapted in its specic structure for the showing of a slide which has been constructed as shown in the drawing of Figure l, but it is obvious that various alterations inv the dimensional relation and disposition of the various structural parts may be made without departing from the spirit and scope of the appended claims.

We claim: n

1. A stereoscope for viewing transparent iilrn pictures, comprising, in combination, twin view-v ing lenses mounted on the outer aspect of the base of an oblong pan-shaped housing, the said housing being provided with an internally con# tained slide-track running longitudinally thro-ugh said housing and having a long dimension of sufficient amplitude for passage therethrough of an oblong picture-mounted slide provided with a plurality of sets of stereo-pairs ocularly spaced in alternating series, said track and slide lying in a plane normal to the line of vision through both the lenses; means for lighting the interior of the housing, comprising an electric-light lamp positioned within the housing behind the slide-track and so disposed that no rays from the lamp may impinge directly upon the slide pictures when they are in the line of vision through thev lenses; a removable gable-roof shaped cover for closing the 4 housing, and which, when in the closing position, is adapted to reflect and disperse the lamp-light from the inner surfaces of the oppositely positioned and angularly disposed slanting inner walls of the said cover; the said stereoscope being further characterized by means for automatically opening and closing the lamp-lighting circuit, such means comprising a normally broken circuit wherein one unjoined end of the Wiring circuit is forced away from its circuit-closing contact-point and into the slide-track by a pressure spring, and being then'so positioned within the said slidetrack that it will in turn be forced out of the track by the counter-pressure produced by the passage of Va picture-slide through the said track, and thus also forced simultaneously into circuitcontact with the other open end of the circuit.

2. A stereoscope, as described in claim 1, iurther characterized by having dependent from the body of the housing, a hollowed handle for containing means for supplying electric power to the internal lighting system, comprising a flash-light battery.

FRANKLIN H. AVERS. EDWARD C. KREBS.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 502,450 Wagner Aug. 1, 1893 570,279 Dion Oct. 27, 1896 722,851 Kirkpatrick et al. Mar. 17, 1903 731,405 Dickson June 16, 1903 1,189,308 VSullivan July 4, 1916 1,443,704 Doxey Jan. 30, 1923 1,462,351 Michelsen July 17, 1923 1,736,071 Cressler Nov. 19, 1929 1,859,665 Golden et al May 24, 1932 1,930,421 Ehmer Oct. 10, 1933 2,019,748 Tuttle Nov. 5, 1935 2,122,649 Kahn July 5, 1938 2,271,530 Wick Feb. 3, 1942 2,336,288 Peterson Dec. 7, 1943 2,349,013 Sparllng May 16, 1944 

